Please help me this my e -learning work

1. what are the missing reasons in the proof 2. it's in the second picture and 3

Jack has a rectangular piece of land, the area of which is represented by a1 = 9.5l. his brother has a different rectangular piece of land, the area of which is represented by a2 = l(14 − l). let a represent the area in square meters and l represent the length in meters of the pieces of land. the two equations plotted on a graph meet at a point as shown in the image

100 points and 1- -12=y-36 2- x/25=-25 3- -n=40